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x in (-oo:+oo)
x/4-(5/3) = (3*x)/8 // - (3*x)/8
x/4-((3*x)/8)-(5/3) = 0
x/4+(-3/8)*x-5/3 = 0
-1/8*x-5/3 = 0 // + 5/3
-1/8*x = 5/3 // : -1/8
x = 5/3/(-1/8)
x = -40/3
x = -40/3
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